





def      a__			(       lowercase__	,     lowercase__	):






   '''simple docstring'''






   if density <= 0:
      raise ValueError("Impossible fluid density"	)
   if bulk_modulus <= 0:
      raise ValueError("Impossible bulk modulus"	)

   return (bulk_modulus / density) ** 0.5


if __name__ == "__main__":
     import doctest

     doctest.testmod()









'''simple docstring'''






import numpy as np
def  lowerCamelCase__			(		_A							):
  return 1 / (1 + np.exp(-vector							))
def  lowerCamelCase__			(		_A							):
  return vector * sigmoid(1.702 * vector							)


if __name__ == "__main__":
     import doctest

     doctest.testmod()